The characteristics of PM2.5, Reactive gas and aerosol size distributions of Beijing from 2013 to 2015

JIANG Qi1 WANG Fei2 ZHANG Heng-de1 WANG Fei3 LÜ Meng-yao1 HE Jia-bao4

(1.National Meteorological Centre, Beijing, China 100081)
(2.Chinese Academy of Meteorological Sciences, Beijing, China 100081)
(3.Beijing Municipal Weather Modification Office, Beijing, China 100089)
(4.Environment Monitoring Center of Ningbo, Ningbo, Zhejiang, China 315012)

【Abstract】PM2.5, gas composition, aerosol spectral distribution and meteorological conditions were systematically analyzed during 2013–2015 in Beijing. Results showed that the PM2.5 mass concentration decreased significantly from 2013 to 2015, and the air quality improved significantly. The contribution of traffic sources to air pollution cannot be neglected and tended to increase gradually. The influence of relative humidity and wind speed on PM2.5 concentration was relatively fast and the biggest influence on PM2.5 concentration was about 1 h time lag. While the PM2.5 response to temperature changes was relatively slow, generally after time lag 7– 8 h before the effect reached to the maximum. The particle size distribution of aerosols moved to the larger size on pollution days than cleaning days. On cleaning days, the diameter of the peak area was concentrated at 3–5 nm, and increased to 100–200 nm on pollution days. With the increasing of precipitation level, the peak concentration of aerosol gradually developed towards to the accumulation mode. During the pollution process, from February 18 to February 21 in 2015, the contribution of fireworks to aerosol number concentration was 26.1% in fireworks time, and accompanied with new particle generation. The discharge of fireworks produced significant peaks in the Accumulation mode and the Aitken mode particles, the Nuclear mode particle concentration changed not much.

【Keywords】 PM2.5; reactive gas; meteorological elements; aerosol particle size spectrum; fireworks;

【DOI】

【Funds】 Special Project of Air Pollution in the Ministry of Science and Technology of China (2016YFC0203301) Key Special Fund for Public Welfare Industry of National Environmental Protection (201509001) Special Scientific Research Fund of Meteorological Public Welfare Profession of China (GYHY201306015) National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAC16B02)

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This Article

ISSN:1000-6923

CN:11-2201/X

Vol 37, No. 10, Pages 3647-3657

October 2017

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Article Outline

Abstract

  • 1 Source of data
  • 2 Results and discussion
  • 3 Conclusion
  • References